19 |
|
void |
20 |
|
inithemi( /* initialize sampling hemisphere */ |
21 |
|
register AMBHEMI *hp, |
22 |
+ |
COLOR ac, |
23 |
|
RAY *r, |
23 |
– |
COLOR ac, |
24 |
|
double wt |
25 |
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) |
26 |
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{ |
27 |
+ |
double d; |
28 |
|
register int i; |
29 |
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/* set number of divisions */ |
30 |
< |
hp->nt = sqrt(ambdiv * wt * (1./PI/AVGREFL)) + 0.5; |
30 |
> |
if (ambacc <= FTINY && |
31 |
> |
wt > (d = 0.8*bright(ac)*r->rweight/(ambdiv*minweight))) |
32 |
> |
wt = d; /* avoid ray termination */ |
33 |
> |
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
34 |
|
i = ambacc > FTINY ? 3 : 1; /* minimum number of samples */ |
35 |
|
if (hp->nt < i) |
36 |
|
hp->nt = i; |
37 |
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hp->np = PI * hp->nt + 0.5; |
38 |
|
/* set number of super-samples */ |
39 |
|
hp->ns = ambssamp * wt + 0.5; |
40 |
< |
/* assign coefficients */ |
40 |
> |
/* assign coefficient */ |
41 |
|
copycolor(hp->acoef, ac); |
42 |
< |
if (wt >= r->rweight) |
43 |
< |
hp->drc = 1.; |
40 |
< |
else |
41 |
< |
hp->drc = wt / r->rweight; |
42 |
> |
d = 1.0/(hp->nt*hp->np); |
43 |
> |
scalecolor(hp->acoef, d); |
44 |
|
/* make axes */ |
45 |
|
VCOPY(hp->uz, r->ron); |
46 |
|
hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |
71 |
|
double phi; |
72 |
|
register int i; |
73 |
|
/* ambient coefficient for weight */ |
74 |
< |
setcolor(ar.rcoef, h->drc, h->drc, h->drc); |
74 |
> |
if (ambacc > FTINY) |
75 |
> |
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
76 |
> |
else |
77 |
> |
copycolor(ar.rcoef, h->acoef); |
78 |
|
if (rayorigin(&ar, AMBIENT, r, ar.rcoef) < 0) |
79 |
|
return(-1); |
80 |
< |
copycolor(ar.rcoef, h->acoef); /* correct coefficient for trace */ |
81 |
< |
b2 = 1.0/(h->nt*h->np + h->ns); /* XXX not uniform if ns > 0 */ |
77 |
< |
scalecolor(ar.rcoef, b2); |
80 |
> |
if (ambacc > FTINY) |
81 |
> |
copycolor(ar.rcoef, h->acoef); |
82 |
|
hlist[0] = r->rno; |
83 |
|
hlist[1] = dp->t; |
84 |
|
hlist[2] = dp->p; |
95 |
|
dimlist[ndims++] = dp->t*h->np + dp->p + 90171; |
96 |
|
rayvalue(&ar); |
97 |
|
ndims--; |
98 |
+ |
multcolor(ar.rcol, ar.rcoef); /* apply coefficient */ |
99 |
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addcolor(dp->v, ar.rcol); |
100 |
|
/* use rt to improve gradient calc */ |
101 |
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if (ar.rt > FTINY && ar.rt < FHUGE) |
148 |
|
doambient( /* compute ambient component */ |
149 |
|
COLOR acol, |
150 |
|
RAY *r, |
146 |
– |
COLOR ac, |
151 |
|
double wt, |
152 |
|
FVECT pg, |
153 |
|
FVECT dg |
161 |
|
double arad; |
162 |
|
int ndivs; |
163 |
|
register int i, j; |
160 |
– |
/* initialize color */ |
161 |
– |
setcolor(acol, 0.0, 0.0, 0.0); |
164 |
|
/* initialize hemisphere */ |
165 |
< |
inithemi(&hemi, r, ac, wt); |
165 |
> |
inithemi(&hemi, acol, r, wt); |
166 |
|
ndivs = hemi.nt * hemi.np; |
167 |
+ |
/* initialize sum */ |
168 |
+ |
setcolor(acol, 0.0, 0.0, 0.0); |
169 |
|
if (ndivs == 0) |
170 |
|
return(0.0); |
171 |
|
/* allocate super-samples */ |
185 |
|
setcolor(dp->v, 0.0, 0.0, 0.0); |
186 |
|
dp->r = 0.0; |
187 |
|
dp->n = 0; |
188 |
< |
if (divsample(dp, &hemi, r) < 0) |
189 |
< |
goto oopsy; |
188 |
> |
if (divsample(dp, &hemi, r) < 0) { |
189 |
> |
if (div != NULL) dp++; |
190 |
> |
continue; |
191 |
> |
} |
192 |
|
arad += dp->r; |
193 |
|
if (div != NULL) |
194 |
|
dp++; |
203 |
|
/* super-sample */ |
204 |
|
for (i = hemi.ns; i > 0; i--) { |
205 |
|
dnew = *div; |
206 |
< |
if (divsample(&dnew, &hemi, r) < 0) |
207 |
< |
goto oopsy; |
208 |
< |
/* reinsert */ |
209 |
< |
dp = div; |
206 |
> |
if (divsample(&dnew, &hemi, r) < 0) { |
207 |
> |
dp++; |
208 |
> |
continue; |
209 |
> |
} |
210 |
> |
dp = div; /* reinsert */ |
211 |
|
j = ndivs < i ? ndivs : i; |
212 |
|
while (--j > 0 && dnew.k < dp[1].k) { |
213 |
|
*dp = *(dp+1); |
233 |
|
} |
234 |
|
b = bright(acol); |
235 |
|
if (b > FTINY) { |
236 |
< |
b = ndivs/b; |
236 |
> |
b = 1.0/b; /* normalize gradient(s) */ |
237 |
|
if (pg != NULL) { |
238 |
|
posgradient(pg, div, &hemi); |
239 |
|
for (i = 0; i < 3; i++) |
254 |
|
} |
255 |
|
free((void *)div); |
256 |
|
} |
250 |
– |
b = 1.0/ndivs; |
251 |
– |
scalecolor(acol, b); |
257 |
|
if (arad <= FTINY) |
258 |
|
arad = maxarad; |
259 |
|
else |
274 |
|
if ((arad /= sqrt(wt)) > maxarad) |
275 |
|
arad = maxarad; |
276 |
|
return(arad); |
272 |
– |
oopsy: |
273 |
– |
if (div != NULL) |
274 |
– |
free((void *)div); |
275 |
– |
return(0.0); |
277 |
|
} |
278 |
|
|
279 |
|
|
383 |
|
yd += mag0*sinp + mag1*cosp; |
384 |
|
} |
385 |
|
for (i = 0; i < 3; i++) |
386 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/PI; |
386 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])*(hp->nt*hp->np)/PI; |
387 |
|
} |
388 |
|
|
389 |
|
|
418 |
|
yd += mag * tsin(phi); |
419 |
|
} |
420 |
|
for (i = 0; i < 3; i++) |
421 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
421 |
> |
gv[i] = xd*hp->ux[i] + yd*hp->uy[i]; |
422 |
|
} |